Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Poster Wednesday: Nanostructures 2
O 56.5: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Methane activation with small Ta clusters — •Kevin Bertrang, Tobias Hinke, Nikita Levin, Martin Tschurl, and Ueli Heiz — Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich
With the exhaustion of petroleum reserves, methane will become an important feedstock for the synthesis of fuels and fine chemicals. The challenge is to find an efficient way to activate the highly inert molecule under mild conditions and steer the reaction towards the formation of chemically precious products while preventing coking.
Studies of small cationic Ta-clusters in the gas phase and their oxides were found to exhibit high activity towards non-oxidative C-C-coupling of methane, yielding dehydrogenated carbohydrate species and ethane. The cluster charge was identified as a key parameter for activity. These studies are extended to their supported analogues. To replenish the cluster charge acidic (SiO2) and reducible (CeO2) thin metal-oxide films are employed and cluster oxygen content is tuned.
Characterization is performed by means of vibrational (IRRAS) and electron spectroscopy (XPS) and reactivity is studied via TPD and pulsed valves experiments.
[1] N. Levin et al. J. Am. Chem. Soc. 2020, 142, 12, 5862-5869